DS90UB940-Q1：ds90ub940-q1

Meng jeffrey

Expert 2760 points

Part Number: DS90UB940-Q1
Other Parts Discussed in Thread: ALP

We are currently debugging the ds90ub940-q1 chip, which can be unrecognized. What is the reason

over 6 years ago

0 Steven(Shenzhen) Shi over 6 years ago

TI__Mastermind 30515 points

you mean the I2C?

best regards,
Steven

0 Bang Duong over 6 years ago in reply to Steven(Shenzhen) Shi

Intellectual 370 points

Hi Steven,
I hope you can help me,
I can't detect I2C address both DS90UB940 and DS90UB947.
I have resistor pull-up 4.7K ohm to VDDI2C 3.3V for both IC.
DS90UB947: I2CSEL leave floating for 3.3V I2C, INTB pull-up 4.7K ohm to VDDIO 1.8V
I tried set appropriate voltage on the IDx input , but still cant detect I2C address
I really need your help.
Brs,
Bang

0 Steven(Shenzhen) Shi over 6 years ago in reply to Bang Duong

TI__Mastermind 30515 points

1. can you use TI's ALP tool to check your on-board UB947?
2. please check the IDX resistor's value and accuracy, and 7bits or 8bits address? also please check your I2C timing.

best regards,
Steven

0 Bang Duong over 6 years ago in reply to Steven(Shenzhen) Shi

Intellectual 370 points

thank you very much!

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DS90UB940-Q1：ds90ub940-q1